小任班长的博客 Execution failed for task ':app:processDebugManifest'.> Manifest merger failed with multiple errors
android Manifest merger failed with multiple errors 排查方法
打开AndroidManifest.xml 文件，点击mergered Manifest查看右侧的错误提示，修复错误后再次编译即可。
idea(android studio)编辑 build.gradle文件就卡死的解决办法
idea菜单，tools - android -sdk manager
分别下载安装SDK中的google repository 和Android support repository：
安装后重启即可解决！
国内常用开源镜像站及maven仓库
企业
* 阿里开源镜像站：http://mirrors.aliyun.com/
* 搜狐开源镜像站：http://mirrors.sohu.com/
* 网易开源镜像站：http://mirrors.163.com/
Maven仓库
MVNRepository： https://mvnrepository.com/ 『搜索你不知道的开发库Maven仓库地址』
阿里云maven镜像仓库： https://maven.aliyun.com/repository/central
网易163 Maven镜像仓库： http://mirrors.163.com/maven/repository/maven-public/
JCenter Maven仓库： http://jcenter.bintray.com 『当前世界上最大的Java和Android开源软件构件仓库』
maven中央仓库 (默认)： http://repo.maven.org/maven2/ http://repo1.maven.org/maven2/
sonatype公司自己也有仓库： https://oss.sonatype.org/#view-repositories
idea2019.7月激活码 亲测有效
激活码如下：
9MWZD5CC4E-eyJsaWNlbnNlSWQiOiI5TVdaRDVDQzRFIiwibGljZW5zZWVOYW1lIjoiMjAxNzY1MDYxQGNxdS5lZHUuY24gLiIsImFzc2lnbmVlTmFtZSI6IiIsImFzc2lnbmVlRW1haWwiOiIiLCJsaWNlbnNlUmVzdHJpY3Rpb24iOiJGb3IgZWR1Y2F0aW9uYWwgdXNlIG9ubHkiLCJjaGVja0NvbmN1cnJlbnRVc2UiOmZhbHNlLCJwcm9kdWN0cyI6W3siY29kZSI6IklJIiwicGFpZFVwVG8iOiIyMDIwLTAxLTI0In0seyJjb2RlIjoiQUMiLCJwYWlkVXBUbyI6IjIwMjAtMDEtMjQifSx7ImNvZGUiOiJEUE4iLCJwYWlkVXBUbyI6IjIwMjAtMDEtMjQifSx7ImNvZGUiOiJQUyIsInBhaWRVcFRvIjoiMjAyMC0wMS0yNCJ9LHsiY29kZSI6IkdPIiwicGFpZFVwVG8iOiIyMDIwLTAxLTI0In0seyJjb2RlIjoiRE0iLCJwYWlkVXBUbyI6IjIwMjAtMDEtMjQifSx7ImNvZGUiOiJDTCIsInBhaWRVcFRvIjoiMjAyMC0wMS0yNCJ9LHsiY29kZSI6IlJTMCIsInBhaWRVcFRvIjoiMjAyMC0wMS0yNCJ9LHsiY29kZSI6IlJDIiwicGFpZFVwVG8iOiIyMDIwLTAxLTI0In0seyJjb2RlIjoiUkQiLCJwYWlkVXBUbyI6IjIwMjAtMDEtMjQifSx7ImNvZGUiOiJQQyIsInBhaWRVcFRvIjoiMjAyMC0wMS0yNCJ9LHsiY29kZSI6IlJNIiwicGFpZFVwVG8iOiIyMDIwLTAxLTI0In0seyJjb2RlIjoiV1MiLCJwYWlkVXBUbyI6IjIwMjAtMDEtMjQifSx7ImNvZGUiOiJEQiIsInBhaWRVcFRvIjoiMjAyMC0wMS0yNCJ9LHsiY29kZSI6IkRDIiwicGFpZFVwVG8iOiIyMDIwLTAxLTI0In0seyJjb2RlIjoiUlNVIiwicGFpZFVwVG8iOiIyMDIwLTAxLTI0In1dLCJoYXNoIjoiMTE3Mzk0NjcvMCIsImdyYWNlUGVyaW9kRGF5cyI6MCwiYXV0b1Byb2xvbmdhdGVkIjpmYWxzZSwiaXNBdXRvUHJvbG9uZ2F0ZWQiOmZhbHNlfQ==-ocfH5r7aj6756M8f6f+7MXdp2K0RxPCG2Yp9/iIydFQxHCSjqjUopo2yAxH8+EtTGm+w4dKPe+6tLqa/HOExPt9g3yOf29PU7oIwmqnIcnvZYGNCgNsCK7fyfxc2CX1whLZTByQ0LKylRshlsYz+HXg002E7q7bY0y3vbwxWLyNR5qY4EPa4WzfWjdnopCZfijgsU0bTRB51jiqVlLHONKjFFUmzPopUDwEHwDTnmNMEUAsluTaiirWIJwkmuFbsgmir+KUAxHvStOUgo68Vyaas7BicAWI1QiCqd1EvFIN/sGaZkRE9hK6FwkDN/hscDX1DCPY62ttgP/k1GvFOVA==-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
mysql查询、修改数据库编码 更改utf8 到 utf8mb4
-- 查询单表数据库编码
show full columns from sys_user;
-- 查询编码
SHOW VARIABLES WHERE Variable_name LIKE 'character_set_%' OR Variable_name LIKE 'collation%';
-- 修改表编码
ALTER TABLE sys_user CONVERT TO CHARACTER SET utf8mb4;
ALTER TABLE account CONVERT TO CHARACTER SET utf8mb4;
-- 修改数据库编码
ALTER DATABASE mydb CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci;
